100 m高钢筋混凝土烟囱双向切口爆破时差研究  

Delay Time of Two-way Cut Demolition Blasting of 100 m High Reinforced Concrete Chimney

作　　者：高文乐 刘志成 李坤鹏 史卓金 GAO Wen-le;LIU Zhi-cheng;LI Kun-peng;SHI Zhuo-jin(School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;China Railway 14th Bureau Construction Branch,Jinan 250014,China)

机构地区：[1]山东科技大学土木工程与建筑学院,青岛266590 [2]中铁十四局建筑分公司,济南250014

出　　处：《爆破》2021年第2期128-135,共8页Blasting

基　　金：国家自然科学基金(51874189)。

摘　　要：由于场地大小的限制,高耸烟囱的爆破拆除需采用折叠倒塌的方式,为进一步研究复杂环境下100 m钢筋混凝土烟囱的双向折叠定向倾倒爆破拆除中上下爆破切口的最优延时起爆时差,利用LS-DYNA联合Hypermesh的数值模拟方法,采用直接法建立共节点分离式模型,将钢筋节点与混凝土节点直接产出单元体,进行数值模拟仿真,同时与工程实际进行对比分析。通过对烟囱上下切口不同起爆时差下的倒塌过程和结果进行模拟分析,得出起爆时差分别为1 s、1.5 s、2 s、2.5 s、3 s下的倒塌过程、烟囱倒地破碎程度、爆堆范围和烟囱触地速度,分析比较后确定上下切口的最优起爆时差为2.5 s,并且数值模拟计算的结果与工程实际高度吻合。Due to the limitation of the size of the site,the demolition blasting of the tall chimney needs to be collapsed.In order to further study the optimal delayed initiation time of the upper and lower blasting cuts in the two-way folding directional dumping blasting demolition of a 100 m reinforced concrete chimney in a complex environment,a common node separation model is established with LS-DYNA and Hypermesh,and the steel joints and concrete joints are directly produced as unit bodies.At the same time,the numerical simulation results are compared and analyzed with the actual project.Through the simulation analysis of the collapse process and results under different delay time of the upper and lower cuts of the chimney,1 s,1.5 s,2 s,2.5 s and 3 s,the collapse degree of the chimney,and the explosion range and after analyzing and comparing the speed of chimney touching the ground,it is determined that the optimal delay time of the upper and lower cuts is 2.5 s.The result of numerical simulation calculation is highly consistent with the actual project.

关 键 词：钢筋混凝土烟囱 双向折叠 爆破拆除 间隔时差 数值模拟 

分 类 号：TU746.5[建筑科学—建筑技术科学]